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<blockquote data-quote="Bart B" data-source="post: 97849" data-attributes="member: 5302"><p>Many barrels have been rebored and rifled to a larger caliber. But they seldom have best accuracy. Here's why.</p><p></p><p>When the boring and rifling tool enters and exits the hole, it's not well supported. This causes each end of the bore to bell out a bit. And these ends are a bit irregular in dimensions, too.</p><p></p><p>Good barrel makers always tell their customers to cut an inch off the front end to get rid of the oversize muzzle. The chambering reamer gets rid of the oversize breech end.</p></blockquote><p></p>
[QUOTE="Bart B, post: 97849, member: 5302"] Many barrels have been rebored and rifled to a larger caliber. But they seldom have best accuracy. Here's why. When the boring and rifling tool enters and exits the hole, it's not well supported. This causes each end of the bore to bell out a bit. And these ends are a bit irregular in dimensions, too. Good barrel makers always tell their customers to cut an inch off the front end to get rid of the oversize muzzle. The chambering reamer gets rid of the oversize breech end. [/QUOTE]
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